Air-pump



A. TERRY.

AIR PUMP- APPLICATION HLED JUNE l3. I919.

' Patented Dec. 30, 1919.

WITNESS:

. Gaza,

A TTORNE Y.

UNITED STATES PATENT OFFICE.

AARON TERRY, OF SPRINGFIELD, MASSACHUSETTS.

AIR-PUMP.

Specification of Letters Patent.

Original application filed March 12, 1919, Serial No. 282,172. Dividedand this application filed June 13,

To all whom it may concern: 7

, Be it known that I, AARON TERRY, a citizen of the United States ofAmerica, residing at Springfield, in the county of Hampden and State ofMassachusetts, have invented a new and useful Air-Pump, of which thefollowing is a specification. My invention relates to means foragitating the air in heating systems for buildings, and consistsgenerally of a hollow cylinder having therein a diaphragmal member whichopens and closes, and a piston arranged to operate in said cylinder andhaving a member which opens and closes, said last-named member beingsimilar to said first-named member, together with such other elements asmay be necessary or desirable to make the pump complete and serviceable,all as hereinafter set forth.

This invention is a divisional part of my application for Letters Patentof the United States, Serial No. 282,172, filed March 12, 1919.

In a hot-air heating system, such as that set forth in the aforesaidapplication, it is necessary to provide mechanical means to inducecirculation, and the primary object of my invention is to provide suchmeans in the form of a pump, which is highly practicable and efficientfor the purpose for which it is designed, and, at the same time, iscomparatively simple and inexpensive in construction and operation.

Other objects and advantages will appear in the course of the fOllOWlngdescription.

I attain the objects and secure the advantages of my invention by themeans illustrated in the accompanying drawings, in which Figure 1 is acentral, vertical section through a pump which embodies a practical formof my invention; Fig. 2, a cross-section through said pump taken onlines 22, looking in the direction of the associated arrow, Fig. 1, and,Fig- 3, a cross-section through said pump, on lines 3-3, looking in thedirection of the associated arrow, Fig. 1.

Similar reference characters designate similar parts throughout theseveral views.

In the first view I Show a fragmentary portion of an outer shell orcasing 1, of an ordinary, hot-air furnace, and the base portion of anintake 1. A horizontal, intake cylinder 5 opens at one end, at 6, intothe Serial N0. 303,869,

casing 1, and is closed at the opposite end by a cap 7. The intake atopens at the bot tom, at 8, into the top of the cylinder 5 at somedistance from the casing 1. p g It is to be understood that the hot airfrom the furnace, after circulatingthrough the system above, returnsthrough the intake t and the cylinder 5' to said furnace to be reheated.And the purpose of the present invention is to provide mechanical meansin the cylinder 5 to promote and accelerate the movement of the airthrough said cylinder into the casing 1, for reasons which are clearlyapparent. 1 will now describe the pump, which in-. cludes the cylinder5,in detail. 1

Rigidly attached to the Walls of the cylin- Patented Dec. 30, 1919a der5, in spaced relationship, and between t the openings 8 and 6, are tworings 9. These rings are crosswise of the cylinder 5, inside, and fourhorizontal rods-10, arranged at equal distances from each other, arerigidly attached to said rings. Mounted to slide on the rods 10, andprovided with a yielding packing-ring 11 to bear upon or against theinside of the walls of the cylinder 5 and maintain a tight joint, is apiston, 12. The right-hand ring 9 is provided with a flapper valve 13,which is hinged at 1% to a supporting member 15 securedto said ring, andarranged to open toward the outlet 6. A similar valve, but given thenu-; meral 16, is hinged at 11, to another plate 15, carried by thepiston 12, and also arrai'iged to open toward the cylinder outlet, itbeing understood that said piston'has an opening, as 17, therethrough,which is covered when said valve is closed. The diameter of the opening17 is as large or, larger than the internal diameter of either ring 9. Across-piece 18 extend across the opening 17 in the piston 12, and saidcross-piece ha a pair of lugs 19 on the left-hand side thereof in thecenter.

An electric motor 20 is mounted on the cylinder 5 at the left of theintake 4. Connected with and driven by the motor 20 is a crank-shaft21,- which is journaled at the lower end in a bearing 22 attached to thebottom of the cylinder 5. A piston-rod 23 is connected at one end withthe crankshaft 21, and at the other end with the'lugs 19 by means of apin 24. 3

When the crank-shaft 21 is rotated by the motor 20,- it causes thepiston 12 to be reciprocated, through the medium of the piston-rod 23..Each time the piston 12 ad vances in the cylinder 5 toward the casing 1,the back pressure of air on the valve 16 closes the same, and at thesame time the force exerted on the air by the advancing members opensthe valve 13, and the air which is immediately in front of the nowclosed piston receives an impaotive blow which drives it into saidcasingsee the dotted lines in Fig. 1 which represent the piston at theforward end of its stroke. The effect of the aforesaid blow is feltthroughout the entire heating system, and circulation is promoted andstimulated thereby. Each time the piston 12 recedes, the forwardpressure of the air which is in the cylinder 5 between the intake 4; andsaid piston 12 causes the valve 16 to open so that said piston isenabled to reach the inner end of its stroke without material oppositionfro-m the air. At the same time the valve 13 is closed by gravityassisted by whatever little suction the piston 12 may produce in movingto the inner end of its travel. Gravity is a factor also in the closingof the valve 16.

It is now plainly to be seen that the air in the heating system abovethe element herein shown and described receives, at every forward strokeof the piston 12, an impulse which tends to keep said air in motion, thecool air that enters the cylinder 5 from said system first receiving theimpact from said piston and thus being urged forward into the casing 1.Here the air rises, is reheated, and continues on its round again. As aresult of forcing the air, which is heated, by the piston into thecasing by means of said piston, the air behind the latter is drawn orsucked forward. Thus the cool air is impelled forward by both a drivingforce and suction.

The piston 12, in Fig. 1, is represented in full lines at the inner endof its stroke, and the valves 16 and 13 are represented in closedposition in full lines and in open position by dotted lines. There is aninstant at each end of the travel of the piston 12 when the valves 16and 13 are both in closed position, but during the forward movement ofsaid piston the valve 13 is opened, and during the rearward movement ofsaid piston the valve 16 is opened, as hereinbefore explained.

Changes in the shape, size, construction, and arrangement of some or allof the parts of this pump may be made, in order to meet varyingconditions and needs, so long as such changes do not exceed the scope ofwhat is claimed, without departing from the spirit of my invention.

lVhat I claim as my invention, and desire to secure by Letters Patentis- 1. The combination, in an air pump, with a cylinder, annular memberssecured within said cylinder, one-of said members being provided with avalve, and supporting and guide members attached to said first-namedmembers, of a piston mounted on said supporting and guide members, saidpiston being provided with a valve, and means to actuate said piston.

52. The combination, in an air pump, with a cylinder, annular memberssecured within said "cylinder, one of such members being provided with aflapper valve, and supporting and guide members attached to saidfirstnamed members, of a piston mounted on said supporting and guidemembers, said piston being provided with a flapper valve which opens inthe same direction as said first-named valve, and means to actuate saidpiston.

3. The combination, in an air pump, with a cylinder, rings securedwithin said cylinder, a flapper valve hinged to one of said rings on oneside, and rods carried by said rings, of a piston having an openingtherein and mounted to slide on said rods, a flapper valve hinged tosaid piston on the side thereof which enables it to swing open in thesame direction as does said first-named valve, and means to actuate saidpiston.

4:. The combination, with the furnace casing, and the intake of ahot-air heating system, of a pump comprising a cylinder opening intosaid casing and intake, a perforated piston arranged to be reciprocatedin said cylinder between said casing and intake, said piston having aflapper valve hinged thereto and adapted to cover the perforationtherein, a ring in said cylinder between said piston and said casing,and a flapper valve hinged to said ring and adapted to cover the openingtherein, said valves being arranged respectively to close and open underforward pressure and open and close under back pressure, and means todrive said pis ton.

5. The combination of a casing, an intake cylinder opening into saidcasing, a perforated piston adapted to be reciprocated in said cylinder,said piston having a flapper valve hinged thereto and adapted to coverthe perforation therein, a ring in said cylinder between said piston andsaid casing, and a flapper valve hinged to said ring and adapted tocover the opening therein, said valves being arranged respectively toclose and open under forward pressureand open and close under backpressure, a crank-shaft in said cylinder, a rod connecting said pistonwith said crank-shaft, means to drive said crank-shaft, and an intakemounted on said cylinder beyond the outer limit of travel of saidpiston.

AARON TERRY.

Witnesses: V

F. A. CUTTER, F. L. WASHBURN.

